linux/drivers/gpu/drm/drm_bufs.c
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   1/**
   2 * \file drm_bufs.c
   3 * Generic buffer template
   4 *
   5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6 * \author Gareth Hughes <gareth@valinux.com>
   7 */
   8
   9/*
  10 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
  11 *
  12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
  13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  14 * All Rights Reserved.
  15 *
  16 * Permission is hereby granted, free of charge, to any person obtaining a
  17 * copy of this software and associated documentation files (the "Software"),
  18 * to deal in the Software without restriction, including without limitation
  19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  20 * and/or sell copies of the Software, and to permit persons to whom the
  21 * Software is furnished to do so, subject to the following conditions:
  22 *
  23 * The above copyright notice and this permission notice (including the next
  24 * paragraph) shall be included in all copies or substantial portions of the
  25 * Software.
  26 *
  27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  33 * OTHER DEALINGS IN THE SOFTWARE.
  34 */
  35
  36#include <linux/vmalloc.h>
  37#include "drmP.h"
  38
  39unsigned long drm_get_resource_start(struct drm_device *dev, unsigned int resource)
  40{
  41        return pci_resource_start(dev->pdev, resource);
  42}
  43EXPORT_SYMBOL(drm_get_resource_start);
  44
  45unsigned long drm_get_resource_len(struct drm_device *dev, unsigned int resource)
  46{
  47        return pci_resource_len(dev->pdev, resource);
  48}
  49
  50EXPORT_SYMBOL(drm_get_resource_len);
  51
  52static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  53                                             drm_local_map_t *map)
  54{
  55        struct drm_map_list *entry;
  56        list_for_each_entry(entry, &dev->maplist, head) {
  57                if (entry->map && map->type == entry->map->type &&
  58                    ((entry->map->offset == map->offset) ||
  59                     (map->type == _DRM_SHM && map->flags==_DRM_CONTAINS_LOCK))) {
  60                        return entry;
  61                }
  62        }
  63
  64        return NULL;
  65}
  66
  67static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  68                          unsigned long user_token, int hashed_handle)
  69{
  70        int use_hashed_handle;
  71#if (BITS_PER_LONG == 64)
  72        use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  73#elif (BITS_PER_LONG == 32)
  74        use_hashed_handle = hashed_handle;
  75#else
  76#error Unsupported long size. Neither 64 nor 32 bits.
  77#endif
  78
  79        if (!use_hashed_handle) {
  80                int ret;
  81                hash->key = user_token >> PAGE_SHIFT;
  82                ret = drm_ht_insert_item(&dev->map_hash, hash);
  83                if (ret != -EINVAL)
  84                        return ret;
  85        }
  86        return drm_ht_just_insert_please(&dev->map_hash, hash,
  87                                         user_token, 32 - PAGE_SHIFT - 3,
  88                                         0, DRM_MAP_HASH_OFFSET >> PAGE_SHIFT);
  89}
  90
  91/**
  92 * Ioctl to specify a range of memory that is available for mapping by a non-root process.
  93 *
  94 * \param inode device inode.
  95 * \param file_priv DRM file private.
  96 * \param cmd command.
  97 * \param arg pointer to a drm_map structure.
  98 * \return zero on success or a negative value on error.
  99 *
 100 * Adjusts the memory offset to its absolute value according to the mapping
 101 * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 102 * applicable and if supported by the kernel.
 103 */
 104static int drm_addmap_core(struct drm_device * dev, unsigned int offset,
 105                           unsigned int size, enum drm_map_type type,
 106                           enum drm_map_flags flags,
 107                           struct drm_map_list ** maplist)
 108{
 109        struct drm_map *map;
 110        struct drm_map_list *list;
 111        drm_dma_handle_t *dmah;
 112        unsigned long user_token;
 113        int ret;
 114
 115        map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
 116        if (!map)
 117                return -ENOMEM;
 118
 119        map->offset = offset;
 120        map->size = size;
 121        map->flags = flags;
 122        map->type = type;
 123
 124        /* Only allow shared memory to be removable since we only keep enough
 125         * book keeping information about shared memory to allow for removal
 126         * when processes fork.
 127         */
 128        if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 129                drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 130                return -EINVAL;
 131        }
 132        DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
 133                  map->offset, map->size, map->type);
 134        if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 135                drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 136                return -EINVAL;
 137        }
 138        map->mtrr = -1;
 139        map->handle = NULL;
 140
 141        switch (map->type) {
 142        case _DRM_REGISTERS:
 143        case _DRM_FRAME_BUFFER:
 144#if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
 145                if (map->offset + (map->size-1) < map->offset ||
 146                    map->offset < virt_to_phys(high_memory)) {
 147                        drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 148                        return -EINVAL;
 149                }
 150#endif
 151#ifdef __alpha__
 152                map->offset += dev->hose->mem_space->start;
 153#endif
 154                /* Some drivers preinitialize some maps, without the X Server
 155                 * needing to be aware of it.  Therefore, we just return success
 156                 * when the server tries to create a duplicate map.
 157                 */
 158                list = drm_find_matching_map(dev, map);
 159                if (list != NULL) {
 160                        if (list->map->size != map->size) {
 161                                DRM_DEBUG("Matching maps of type %d with "
 162                                          "mismatched sizes, (%ld vs %ld)\n",
 163                                          map->type, map->size,
 164                                          list->map->size);
 165                                list->map->size = map->size;
 166                        }
 167
 168                        drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 169                        *maplist = list;
 170                        return 0;
 171                }
 172
 173                if (drm_core_has_MTRR(dev)) {
 174                        if (map->type == _DRM_FRAME_BUFFER ||
 175                            (map->flags & _DRM_WRITE_COMBINING)) {
 176                                map->mtrr = mtrr_add(map->offset, map->size,
 177                                                     MTRR_TYPE_WRCOMB, 1);
 178                        }
 179                }
 180                if (map->type == _DRM_REGISTERS) {
 181                        map->handle = ioremap(map->offset, map->size);
 182                        if (!map->handle) {
 183                                drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 184                                return -ENOMEM;
 185                        }
 186                }
 187
 188                break;
 189        case _DRM_SHM:
 190                list = drm_find_matching_map(dev, map);
 191                if (list != NULL) {
 192                        if(list->map->size != map->size) {
 193                                DRM_DEBUG("Matching maps of type %d with "
 194                                          "mismatched sizes, (%ld vs %ld)\n",
 195                                          map->type, map->size, list->map->size);
 196                                list->map->size = map->size;
 197                        }
 198
 199                        drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 200                        *maplist = list;
 201                        return 0;
 202                }
 203                map->handle = vmalloc_user(map->size);
 204                DRM_DEBUG("%lu %d %p\n",
 205                          map->size, drm_order(map->size), map->handle);
 206                if (!map->handle) {
 207                        drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 208                        return -ENOMEM;
 209                }
 210                map->offset = (unsigned long)map->handle;
 211                if (map->flags & _DRM_CONTAINS_LOCK) {
 212                        /* Prevent a 2nd X Server from creating a 2nd lock */
 213                        if (dev->lock.hw_lock != NULL) {
 214                                vfree(map->handle);
 215                                drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 216                                return -EBUSY;
 217                        }
 218                        dev->sigdata.lock = dev->lock.hw_lock = map->handle;    /* Pointer to lock */
 219                }
 220                break;
 221        case _DRM_AGP: {
 222                struct drm_agp_mem *entry;
 223                int valid = 0;
 224
 225                if (!drm_core_has_AGP(dev)) {
 226                        drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 227                        return -EINVAL;
 228                }
 229#ifdef __alpha__
 230                map->offset += dev->hose->mem_space->start;
 231#endif
 232                /* In some cases (i810 driver), user space may have already
 233                 * added the AGP base itself, because dev->agp->base previously
 234                 * only got set during AGP enable.  So, only add the base
 235                 * address if the map's offset isn't already within the
 236                 * aperture.
 237                 */
 238                if (map->offset < dev->agp->base ||
 239                    map->offset > dev->agp->base +
 240                    dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 241                        map->offset += dev->agp->base;
 242                }
 243                map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 244
 245                /* This assumes the DRM is in total control of AGP space.
 246                 * It's not always the case as AGP can be in the control
 247                 * of user space (i.e. i810 driver). So this loop will get
 248                 * skipped and we double check that dev->agp->memory is
 249                 * actually set as well as being invalid before EPERM'ing
 250                 */
 251                list_for_each_entry(entry, &dev->agp->memory, head) {
 252                        if ((map->offset >= entry->bound) &&
 253                            (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 254                                valid = 1;
 255                                break;
 256                        }
 257                }
 258                if (!list_empty(&dev->agp->memory) && !valid) {
 259                        drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 260                        return -EPERM;
 261                }
 262                DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size);
 263
 264                break;
 265        }
 266        case _DRM_SCATTER_GATHER:
 267                if (!dev->sg) {
 268                        drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 269                        return -EINVAL;
 270                }
 271                map->offset += (unsigned long)dev->sg->virtual;
 272                break;
 273        case _DRM_CONSISTENT:
 274                /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 275                 * As we're limiting the address to 2^32-1 (or less),
 276                 * casting it down to 32 bits is no problem, but we
 277                 * need to point to a 64bit variable first. */
 278                dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
 279                if (!dmah) {
 280                        drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 281                        return -ENOMEM;
 282                }
 283                map->handle = dmah->vaddr;
 284                map->offset = (unsigned long)dmah->busaddr;
 285                kfree(dmah);
 286                break;
 287        default:
 288                drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 289                return -EINVAL;
 290        }
 291
 292        list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
 293        if (!list) {
 294                if (map->type == _DRM_REGISTERS)
 295                        iounmap(map->handle);
 296                drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 297                return -EINVAL;
 298        }
 299        memset(list, 0, sizeof(*list));
 300        list->map = map;
 301
 302        mutex_lock(&dev->struct_mutex);
 303        list_add(&list->head, &dev->maplist);
 304
 305        /* Assign a 32-bit handle */
 306        /* We do it here so that dev->struct_mutex protects the increment */
 307        user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 308                map->offset;
 309        ret = drm_map_handle(dev, &list->hash, user_token, 0);
 310        if (ret) {
 311                if (map->type == _DRM_REGISTERS)
 312                        iounmap(map->handle);
 313                drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 314                drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 315                mutex_unlock(&dev->struct_mutex);
 316                return ret;
 317        }
 318
 319        list->user_token = list->hash.key << PAGE_SHIFT;
 320        mutex_unlock(&dev->struct_mutex);
 321
 322        *maplist = list;
 323        return 0;
 324        }
 325
 326int drm_addmap(struct drm_device * dev, unsigned int offset,
 327               unsigned int size, enum drm_map_type type,
 328               enum drm_map_flags flags, drm_local_map_t ** map_ptr)
 329{
 330        struct drm_map_list *list;
 331        int rc;
 332
 333        rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 334        if (!rc)
 335                *map_ptr = list->map;
 336        return rc;
 337}
 338
 339EXPORT_SYMBOL(drm_addmap);
 340
 341int drm_addmap_ioctl(struct drm_device *dev, void *data,
 342                     struct drm_file *file_priv)
 343{
 344        struct drm_map *map = data;
 345        struct drm_map_list *maplist;
 346        int err;
 347
 348        if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP))
 349                return -EPERM;
 350
 351        err = drm_addmap_core(dev, map->offset, map->size, map->type,
 352                              map->flags, &maplist);
 353
 354        if (err)
 355                return err;
 356
 357        /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 358        map->handle = (void *)(unsigned long)maplist->user_token;
 359        return 0;
 360}
 361
 362/**
 363 * Remove a map private from list and deallocate resources if the mapping
 364 * isn't in use.
 365 *
 366 * \param inode device inode.
 367 * \param file_priv DRM file private.
 368 * \param cmd command.
 369 * \param arg pointer to a struct drm_map structure.
 370 * \return zero on success or a negative value on error.
 371 *
 372 * Searches the map on drm_device::maplist, removes it from the list, see if
 373 * its being used, and free any associate resource (such as MTRR's) if it's not
 374 * being on use.
 375 *
 376 * \sa drm_addmap
 377 */
 378int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
 379{
 380        struct drm_map_list *r_list = NULL, *list_t;
 381        drm_dma_handle_t dmah;
 382        int found = 0;
 383
 384        /* Find the list entry for the map and remove it */
 385        list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 386                if (r_list->map == map) {
 387                        list_del(&r_list->head);
 388                        drm_ht_remove_key(&dev->map_hash,
 389                                          r_list->user_token >> PAGE_SHIFT);
 390                        drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
 391                        found = 1;
 392                        break;
 393                }
 394        }
 395
 396        if (!found)
 397                return -EINVAL;
 398
 399        switch (map->type) {
 400        case _DRM_REGISTERS:
 401                iounmap(map->handle);
 402                /* FALLTHROUGH */
 403        case _DRM_FRAME_BUFFER:
 404                if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 405                        int retcode;
 406                        retcode = mtrr_del(map->mtrr, map->offset, map->size);
 407                        DRM_DEBUG("mtrr_del=%d\n", retcode);
 408                }
 409                break;
 410        case _DRM_SHM:
 411                vfree(map->handle);
 412                break;
 413        case _DRM_AGP:
 414        case _DRM_SCATTER_GATHER:
 415                break;
 416        case _DRM_CONSISTENT:
 417                dmah.vaddr = map->handle;
 418                dmah.busaddr = map->offset;
 419                dmah.size = map->size;
 420                __drm_pci_free(dev, &dmah);
 421                break;
 422        }
 423        drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 424
 425        return 0;
 426}
 427
 428int drm_rmmap(struct drm_device *dev, drm_local_map_t *map)
 429{
 430        int ret;
 431
 432        mutex_lock(&dev->struct_mutex);
 433        ret = drm_rmmap_locked(dev, map);
 434        mutex_unlock(&dev->struct_mutex);
 435
 436        return ret;
 437}
 438EXPORT_SYMBOL(drm_rmmap);
 439
 440/* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 441 * the last close of the device, and this is necessary for cleanup when things
 442 * exit uncleanly.  Therefore, having userland manually remove mappings seems
 443 * like a pointless exercise since they're going away anyway.
 444 *
 445 * One use case might be after addmap is allowed for normal users for SHM and
 446 * gets used by drivers that the server doesn't need to care about.  This seems
 447 * unlikely.
 448 */
 449int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 450                    struct drm_file *file_priv)
 451{
 452        struct drm_map *request = data;
 453        drm_local_map_t *map = NULL;
 454        struct drm_map_list *r_list;
 455        int ret;
 456
 457        mutex_lock(&dev->struct_mutex);
 458        list_for_each_entry(r_list, &dev->maplist, head) {
 459                if (r_list->map &&
 460                    r_list->user_token == (unsigned long)request->handle &&
 461                    r_list->map->flags & _DRM_REMOVABLE) {
 462                        map = r_list->map;
 463                        break;
 464                }
 465        }
 466
 467        /* List has wrapped around to the head pointer, or its empty we didn't
 468         * find anything.
 469         */
 470        if (list_empty(&dev->maplist) || !map) {
 471                mutex_unlock(&dev->struct_mutex);
 472                return -EINVAL;
 473        }
 474
 475        /* Register and framebuffer maps are permanent */
 476        if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 477                mutex_unlock(&dev->struct_mutex);
 478                return 0;
 479        }
 480
 481        ret = drm_rmmap_locked(dev, map);
 482
 483        mutex_unlock(&dev->struct_mutex);
 484
 485        return ret;
 486}
 487
 488/**
 489 * Cleanup after an error on one of the addbufs() functions.
 490 *
 491 * \param dev DRM device.
 492 * \param entry buffer entry where the error occurred.
 493 *
 494 * Frees any pages and buffers associated with the given entry.
 495 */
 496static void drm_cleanup_buf_error(struct drm_device * dev,
 497                                  struct drm_buf_entry * entry)
 498{
 499        int i;
 500
 501        if (entry->seg_count) {
 502                for (i = 0; i < entry->seg_count; i++) {
 503                        if (entry->seglist[i]) {
 504                                drm_pci_free(dev, entry->seglist[i]);
 505                        }
 506                }
 507                drm_free(entry->seglist,
 508                         entry->seg_count *
 509                         sizeof(*entry->seglist), DRM_MEM_SEGS);
 510
 511                entry->seg_count = 0;
 512        }
 513
 514        if (entry->buf_count) {
 515                for (i = 0; i < entry->buf_count; i++) {
 516                        if (entry->buflist[i].dev_private) {
 517                                drm_free(entry->buflist[i].dev_private,
 518                                         entry->buflist[i].dev_priv_size,
 519                                         DRM_MEM_BUFS);
 520                        }
 521                }
 522                drm_free(entry->buflist,
 523                         entry->buf_count *
 524                         sizeof(*entry->buflist), DRM_MEM_BUFS);
 525
 526                entry->buf_count = 0;
 527        }
 528}
 529
 530#if __OS_HAS_AGP
 531/**
 532 * Add AGP buffers for DMA transfers.
 533 *
 534 * \param dev struct drm_device to which the buffers are to be added.
 535 * \param request pointer to a struct drm_buf_desc describing the request.
 536 * \return zero on success or a negative number on failure.
 537 *
 538 * After some sanity checks creates a drm_buf structure for each buffer and
 539 * reallocates the buffer list of the same size order to accommodate the new
 540 * buffers.
 541 */
 542int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 543{
 544        struct drm_device_dma *dma = dev->dma;
 545        struct drm_buf_entry *entry;
 546        struct drm_agp_mem *agp_entry;
 547        struct drm_buf *buf;
 548        unsigned long offset;
 549        unsigned long agp_offset;
 550        int count;
 551        int order;
 552        int size;
 553        int alignment;
 554        int page_order;
 555        int total;
 556        int byte_count;
 557        int i, valid;
 558        struct drm_buf **temp_buflist;
 559
 560        if (!dma)
 561                return -EINVAL;
 562
 563        count = request->count;
 564        order = drm_order(request->size);
 565        size = 1 << order;
 566
 567        alignment = (request->flags & _DRM_PAGE_ALIGN)
 568            ? PAGE_ALIGN(size) : size;
 569        page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 570        total = PAGE_SIZE << page_order;
 571
 572        byte_count = 0;
 573        agp_offset = dev->agp->base + request->agp_start;
 574
 575        DRM_DEBUG("count:      %d\n", count);
 576        DRM_DEBUG("order:      %d\n", order);
 577        DRM_DEBUG("size:       %d\n", size);
 578        DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 579        DRM_DEBUG("alignment:  %d\n", alignment);
 580        DRM_DEBUG("page_order: %d\n", page_order);
 581        DRM_DEBUG("total:      %d\n", total);
 582
 583        if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 584                return -EINVAL;
 585        if (dev->queue_count)
 586                return -EBUSY;  /* Not while in use */
 587
 588        /* Make sure buffers are located in AGP memory that we own */
 589        valid = 0;
 590        list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 591                if ((agp_offset >= agp_entry->bound) &&
 592                    (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 593                        valid = 1;
 594                        break;
 595                }
 596        }
 597        if (!list_empty(&dev->agp->memory) && !valid) {
 598                DRM_DEBUG("zone invalid\n");
 599                return -EINVAL;
 600        }
 601        spin_lock(&dev->count_lock);
 602        if (dev->buf_use) {
 603                spin_unlock(&dev->count_lock);
 604                return -EBUSY;
 605        }
 606        atomic_inc(&dev->buf_alloc);
 607        spin_unlock(&dev->count_lock);
 608
 609        mutex_lock(&dev->struct_mutex);
 610        entry = &dma->bufs[order];
 611        if (entry->buf_count) {
 612                mutex_unlock(&dev->struct_mutex);
 613                atomic_dec(&dev->buf_alloc);
 614                return -ENOMEM; /* May only call once for each order */
 615        }
 616
 617        if (count < 0 || count > 4096) {
 618                mutex_unlock(&dev->struct_mutex);
 619                atomic_dec(&dev->buf_alloc);
 620                return -EINVAL;
 621        }
 622
 623        entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 624                                   DRM_MEM_BUFS);
 625        if (!entry->buflist) {
 626                mutex_unlock(&dev->struct_mutex);
 627                atomic_dec(&dev->buf_alloc);
 628                return -ENOMEM;
 629        }
 630        memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 631
 632        entry->buf_size = size;
 633        entry->page_order = page_order;
 634
 635        offset = 0;
 636
 637        while (entry->buf_count < count) {
 638                buf = &entry->buflist[entry->buf_count];
 639                buf->idx = dma->buf_count + entry->buf_count;
 640                buf->total = alignment;
 641                buf->order = order;
 642                buf->used = 0;
 643
 644                buf->offset = (dma->byte_count + offset);
 645                buf->bus_address = agp_offset + offset;
 646                buf->address = (void *)(agp_offset + offset);
 647                buf->next = NULL;
 648                buf->waiting = 0;
 649                buf->pending = 0;
 650                init_waitqueue_head(&buf->dma_wait);
 651                buf->file_priv = NULL;
 652
 653                buf->dev_priv_size = dev->driver->dev_priv_size;
 654                buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 655                if (!buf->dev_private) {
 656                        /* Set count correctly so we free the proper amount. */
 657                        entry->buf_count = count;
 658                        drm_cleanup_buf_error(dev, entry);
 659                        mutex_unlock(&dev->struct_mutex);
 660                        atomic_dec(&dev->buf_alloc);
 661                        return -ENOMEM;
 662                }
 663                memset(buf->dev_private, 0, buf->dev_priv_size);
 664
 665                DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 666
 667                offset += alignment;
 668                entry->buf_count++;
 669                byte_count += PAGE_SIZE << page_order;
 670        }
 671
 672        DRM_DEBUG("byte_count: %d\n", byte_count);
 673
 674        temp_buflist = drm_realloc(dma->buflist,
 675                                   dma->buf_count * sizeof(*dma->buflist),
 676                                   (dma->buf_count + entry->buf_count)
 677                                   * sizeof(*dma->buflist), DRM_MEM_BUFS);
 678        if (!temp_buflist) {
 679                /* Free the entry because it isn't valid */
 680                drm_cleanup_buf_error(dev, entry);
 681                mutex_unlock(&dev->struct_mutex);
 682                atomic_dec(&dev->buf_alloc);
 683                return -ENOMEM;
 684        }
 685        dma->buflist = temp_buflist;
 686
 687        for (i = 0; i < entry->buf_count; i++) {
 688                dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 689        }
 690
 691        dma->buf_count += entry->buf_count;
 692        dma->seg_count += entry->seg_count;
 693        dma->page_count += byte_count >> PAGE_SHIFT;
 694        dma->byte_count += byte_count;
 695
 696        DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 697        DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 698
 699        mutex_unlock(&dev->struct_mutex);
 700
 701        request->count = entry->buf_count;
 702        request->size = size;
 703
 704        dma->flags = _DRM_DMA_USE_AGP;
 705
 706        atomic_dec(&dev->buf_alloc);
 707        return 0;
 708}
 709EXPORT_SYMBOL(drm_addbufs_agp);
 710#endif                          /* __OS_HAS_AGP */
 711
 712int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 713{
 714        struct drm_device_dma *dma = dev->dma;
 715        int count;
 716        int order;
 717        int size;
 718        int total;
 719        int page_order;
 720        struct drm_buf_entry *entry;
 721        drm_dma_handle_t *dmah;
 722        struct drm_buf *buf;
 723        int alignment;
 724        unsigned long offset;
 725        int i;
 726        int byte_count;
 727        int page_count;
 728        unsigned long *temp_pagelist;
 729        struct drm_buf **temp_buflist;
 730
 731        if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 732                return -EINVAL;
 733
 734        if (!dma)
 735                return -EINVAL;
 736
 737        if (!capable(CAP_SYS_ADMIN))
 738                return -EPERM;
 739
 740        count = request->count;
 741        order = drm_order(request->size);
 742        size = 1 << order;
 743
 744        DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 745                  request->count, request->size, size, order, dev->queue_count);
 746
 747        if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 748                return -EINVAL;
 749        if (dev->queue_count)
 750                return -EBUSY;  /* Not while in use */
 751
 752        alignment = (request->flags & _DRM_PAGE_ALIGN)
 753            ? PAGE_ALIGN(size) : size;
 754        page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 755        total = PAGE_SIZE << page_order;
 756
 757        spin_lock(&dev->count_lock);
 758        if (dev->buf_use) {
 759                spin_unlock(&dev->count_lock);
 760                return -EBUSY;
 761        }
 762        atomic_inc(&dev->buf_alloc);
 763        spin_unlock(&dev->count_lock);
 764
 765        mutex_lock(&dev->struct_mutex);
 766        entry = &dma->bufs[order];
 767        if (entry->buf_count) {
 768                mutex_unlock(&dev->struct_mutex);
 769                atomic_dec(&dev->buf_alloc);
 770                return -ENOMEM; /* May only call once for each order */
 771        }
 772
 773        if (count < 0 || count > 4096) {
 774                mutex_unlock(&dev->struct_mutex);
 775                atomic_dec(&dev->buf_alloc);
 776                return -EINVAL;
 777        }
 778
 779        entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 780                                   DRM_MEM_BUFS);
 781        if (!entry->buflist) {
 782                mutex_unlock(&dev->struct_mutex);
 783                atomic_dec(&dev->buf_alloc);
 784                return -ENOMEM;
 785        }
 786        memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 787
 788        entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 789                                   DRM_MEM_SEGS);
 790        if (!entry->seglist) {
 791                drm_free(entry->buflist,
 792                         count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 793                mutex_unlock(&dev->struct_mutex);
 794                atomic_dec(&dev->buf_alloc);
 795                return -ENOMEM;
 796        }
 797        memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 798
 799        /* Keep the original pagelist until we know all the allocations
 800         * have succeeded
 801         */
 802        temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 803                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 804        if (!temp_pagelist) {
 805                drm_free(entry->buflist,
 806                         count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 807                drm_free(entry->seglist,
 808                         count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 809                mutex_unlock(&dev->struct_mutex);
 810                atomic_dec(&dev->buf_alloc);
 811                return -ENOMEM;
 812        }
 813        memcpy(temp_pagelist,
 814               dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 815        DRM_DEBUG("pagelist: %d entries\n",
 816                  dma->page_count + (count << page_order));
 817
 818        entry->buf_size = size;
 819        entry->page_order = page_order;
 820        byte_count = 0;
 821        page_count = 0;
 822
 823        while (entry->buf_count < count) {
 824
 825                dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 826
 827                if (!dmah) {
 828                        /* Set count correctly so we free the proper amount. */
 829                        entry->buf_count = count;
 830                        entry->seg_count = count;
 831                        drm_cleanup_buf_error(dev, entry);
 832                        drm_free(temp_pagelist,
 833                                 (dma->page_count + (count << page_order))
 834                                 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 835                        mutex_unlock(&dev->struct_mutex);
 836                        atomic_dec(&dev->buf_alloc);
 837                        return -ENOMEM;
 838                }
 839                entry->seglist[entry->seg_count++] = dmah;
 840                for (i = 0; i < (1 << page_order); i++) {
 841                        DRM_DEBUG("page %d @ 0x%08lx\n",
 842                                  dma->page_count + page_count,
 843                                  (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 844                        temp_pagelist[dma->page_count + page_count++]
 845                                = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 846                }
 847                for (offset = 0;
 848                     offset + size <= total && entry->buf_count < count;
 849                     offset += alignment, ++entry->buf_count) {
 850                        buf = &entry->buflist[entry->buf_count];
 851                        buf->idx = dma->buf_count + entry->buf_count;
 852                        buf->total = alignment;
 853                        buf->order = order;
 854                        buf->used = 0;
 855                        buf->offset = (dma->byte_count + byte_count + offset);
 856                        buf->address = (void *)(dmah->vaddr + offset);
 857                        buf->bus_address = dmah->busaddr + offset;
 858                        buf->next = NULL;
 859                        buf->waiting = 0;
 860                        buf->pending = 0;
 861                        init_waitqueue_head(&buf->dma_wait);
 862                        buf->file_priv = NULL;
 863
 864                        buf->dev_priv_size = dev->driver->dev_priv_size;
 865                        buf->dev_private = drm_alloc(buf->dev_priv_size,
 866                                                     DRM_MEM_BUFS);
 867                        if (!buf->dev_private) {
 868                                /* Set count correctly so we free the proper amount. */
 869                                entry->buf_count = count;
 870                                entry->seg_count = count;
 871                                drm_cleanup_buf_error(dev, entry);
 872                                drm_free(temp_pagelist,
 873                                         (dma->page_count +
 874                                          (count << page_order))
 875                                         * sizeof(*dma->pagelist),
 876                                         DRM_MEM_PAGES);
 877                                mutex_unlock(&dev->struct_mutex);
 878                                atomic_dec(&dev->buf_alloc);
 879                                return -ENOMEM;
 880                        }
 881                        memset(buf->dev_private, 0, buf->dev_priv_size);
 882
 883                        DRM_DEBUG("buffer %d @ %p\n",
 884                                  entry->buf_count, buf->address);
 885                }
 886                byte_count += PAGE_SIZE << page_order;
 887        }
 888
 889        temp_buflist = drm_realloc(dma->buflist,
 890                                   dma->buf_count * sizeof(*dma->buflist),
 891                                   (dma->buf_count + entry->buf_count)
 892                                   * sizeof(*dma->buflist), DRM_MEM_BUFS);
 893        if (!temp_buflist) {
 894                /* Free the entry because it isn't valid */
 895                drm_cleanup_buf_error(dev, entry);
 896                drm_free(temp_pagelist,
 897                         (dma->page_count + (count << page_order))
 898                         * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 899                mutex_unlock(&dev->struct_mutex);
 900                atomic_dec(&dev->buf_alloc);
 901                return -ENOMEM;
 902        }
 903        dma->buflist = temp_buflist;
 904
 905        for (i = 0; i < entry->buf_count; i++) {
 906                dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 907        }
 908
 909        /* No allocations failed, so now we can replace the orginal pagelist
 910         * with the new one.
 911         */
 912        if (dma->page_count) {
 913                drm_free(dma->pagelist,
 914                         dma->page_count * sizeof(*dma->pagelist),
 915                         DRM_MEM_PAGES);
 916        }
 917        dma->pagelist = temp_pagelist;
 918
 919        dma->buf_count += entry->buf_count;
 920        dma->seg_count += entry->seg_count;
 921        dma->page_count += entry->seg_count << page_order;
 922        dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 923
 924        mutex_unlock(&dev->struct_mutex);
 925
 926        request->count = entry->buf_count;
 927        request->size = size;
 928
 929        if (request->flags & _DRM_PCI_BUFFER_RO)
 930                dma->flags = _DRM_DMA_USE_PCI_RO;
 931
 932        atomic_dec(&dev->buf_alloc);
 933        return 0;
 934
 935}
 936EXPORT_SYMBOL(drm_addbufs_pci);
 937
 938static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
 939{
 940        struct drm_device_dma *dma = dev->dma;
 941        struct drm_buf_entry *entry;
 942        struct drm_buf *buf;
 943        unsigned long offset;
 944        unsigned long agp_offset;
 945        int count;
 946        int order;
 947        int size;
 948        int alignment;
 949        int page_order;
 950        int total;
 951        int byte_count;
 952        int i;
 953        struct drm_buf **temp_buflist;
 954
 955        if (!drm_core_check_feature(dev, DRIVER_SG))
 956                return -EINVAL;
 957
 958        if (!dma)
 959                return -EINVAL;
 960
 961        if (!capable(CAP_SYS_ADMIN))
 962                return -EPERM;
 963
 964        count = request->count;
 965        order = drm_order(request->size);
 966        size = 1 << order;
 967
 968        alignment = (request->flags & _DRM_PAGE_ALIGN)
 969            ? PAGE_ALIGN(size) : size;
 970        page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 971        total = PAGE_SIZE << page_order;
 972
 973        byte_count = 0;
 974        agp_offset = request->agp_start;
 975
 976        DRM_DEBUG("count:      %d\n", count);
 977        DRM_DEBUG("order:      %d\n", order);
 978        DRM_DEBUG("size:       %d\n", size);
 979        DRM_DEBUG("agp_offset: %lu\n", agp_offset);
 980        DRM_DEBUG("alignment:  %d\n", alignment);
 981        DRM_DEBUG("page_order: %d\n", page_order);
 982        DRM_DEBUG("total:      %d\n", total);
 983
 984        if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 985                return -EINVAL;
 986        if (dev->queue_count)
 987                return -EBUSY;  /* Not while in use */
 988
 989        spin_lock(&dev->count_lock);
 990        if (dev->buf_use) {
 991                spin_unlock(&dev->count_lock);
 992                return -EBUSY;
 993        }
 994        atomic_inc(&dev->buf_alloc);
 995        spin_unlock(&dev->count_lock);
 996
 997        mutex_lock(&dev->struct_mutex);
 998        entry = &dma->bufs[order];
 999        if (entry->buf_count) {
1000                mutex_unlock(&dev->struct_mutex);
1001                atomic_dec(&dev->buf_alloc);
1002                return -ENOMEM; /* May only call once for each order */
1003        }
1004
1005        if (count < 0 || count > 4096) {
1006                mutex_unlock(&dev->struct_mutex);
1007                atomic_dec(&dev->buf_alloc);
1008                return -EINVAL;
1009        }
1010
1011        entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1012                                   DRM_MEM_BUFS);
1013        if (!entry->buflist) {
1014                mutex_unlock(&dev->struct_mutex);
1015                atomic_dec(&dev->buf_alloc);
1016                return -ENOMEM;
1017        }
1018        memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1019
1020        entry->buf_size = size;
1021        entry->page_order = page_order;
1022
1023        offset = 0;
1024
1025        while (entry->buf_count < count) {
1026                buf = &entry->buflist[entry->buf_count];
1027                buf->idx = dma->buf_count + entry->buf_count;
1028                buf->total = alignment;
1029                buf->order = order;
1030                buf->used = 0;
1031
1032                buf->offset = (dma->byte_count + offset);
1033                buf->bus_address = agp_offset + offset;
1034                buf->address = (void *)(agp_offset + offset
1035                                        + (unsigned long)dev->sg->virtual);
1036                buf->next = NULL;
1037                buf->waiting = 0;
1038                buf->pending = 0;
1039                init_waitqueue_head(&buf->dma_wait);
1040                buf->file_priv = NULL;
1041
1042                buf->dev_priv_size = dev->driver->dev_priv_size;
1043                buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1044                if (!buf->dev_private) {
1045                        /* Set count correctly so we free the proper amount. */
1046                        entry->buf_count = count;
1047                        drm_cleanup_buf_error(dev, entry);
1048                        mutex_unlock(&dev->struct_mutex);
1049                        atomic_dec(&dev->buf_alloc);
1050                        return -ENOMEM;
1051                }
1052
1053                memset(buf->dev_private, 0, buf->dev_priv_size);
1054
1055                DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1056
1057                offset += alignment;
1058                entry->buf_count++;
1059                byte_count += PAGE_SIZE << page_order;
1060        }
1061
1062        DRM_DEBUG("byte_count: %d\n", byte_count);
1063
1064        temp_buflist = drm_realloc(dma->buflist,
1065                                   dma->buf_count * sizeof(*dma->buflist),
1066                                   (dma->buf_count + entry->buf_count)
1067                                   * sizeof(*dma->buflist), DRM_MEM_BUFS);
1068        if (!temp_buflist) {
1069                /* Free the entry because it isn't valid */
1070                drm_cleanup_buf_error(dev, entry);
1071                mutex_unlock(&dev->struct_mutex);
1072                atomic_dec(&dev->buf_alloc);
1073                return -ENOMEM;
1074        }
1075        dma->buflist = temp_buflist;
1076
1077        for (i = 0; i < entry->buf_count; i++) {
1078                dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1079        }
1080
1081        dma->buf_count += entry->buf_count;
1082        dma->seg_count += entry->seg_count;
1083        dma->page_count += byte_count >> PAGE_SHIFT;
1084        dma->byte_count += byte_count;
1085
1086        DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1087        DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1088
1089        mutex_unlock(&dev->struct_mutex);
1090
1091        request->count = entry->buf_count;
1092        request->size = size;
1093
1094        dma->flags = _DRM_DMA_USE_SG;
1095
1096        atomic_dec(&dev->buf_alloc);
1097        return 0;
1098}
1099
1100static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1101{
1102        struct drm_device_dma *dma = dev->dma;
1103        struct drm_buf_entry *entry;
1104        struct drm_buf *buf;
1105        unsigned long offset;
1106        unsigned long agp_offset;
1107        int count;
1108        int order;
1109        int size;
1110        int alignment;
1111        int page_order;
1112        int total;
1113        int byte_count;
1114        int i;
1115        struct drm_buf **temp_buflist;
1116
1117        if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1118                return -EINVAL;
1119
1120        if (!dma)
1121                return -EINVAL;
1122
1123        if (!capable(CAP_SYS_ADMIN))
1124                return -EPERM;
1125
1126        count = request->count;
1127        order = drm_order(request->size);
1128        size = 1 << order;
1129
1130        alignment = (request->flags & _DRM_PAGE_ALIGN)
1131            ? PAGE_ALIGN(size) : size;
1132        page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1133        total = PAGE_SIZE << page_order;
1134
1135        byte_count = 0;
1136        agp_offset = request->agp_start;
1137
1138        DRM_DEBUG("count:      %d\n", count);
1139        DRM_DEBUG("order:      %d\n", order);
1140        DRM_DEBUG("size:       %d\n", size);
1141        DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1142        DRM_DEBUG("alignment:  %d\n", alignment);
1143        DRM_DEBUG("page_order: %d\n", page_order);
1144        DRM_DEBUG("total:      %d\n", total);
1145
1146        if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1147                return -EINVAL;
1148        if (dev->queue_count)
1149                return -EBUSY;  /* Not while in use */
1150
1151        spin_lock(&dev->count_lock);
1152        if (dev->buf_use) {
1153                spin_unlock(&dev->count_lock);
1154                return -EBUSY;
1155        }
1156        atomic_inc(&dev->buf_alloc);
1157        spin_unlock(&dev->count_lock);
1158
1159        mutex_lock(&dev->struct_mutex);
1160        entry = &dma->bufs[order];
1161        if (entry->buf_count) {
1162                mutex_unlock(&dev->struct_mutex);
1163                atomic_dec(&dev->buf_alloc);
1164                return -ENOMEM; /* May only call once for each order */
1165        }
1166
1167        if (count < 0 || count > 4096) {
1168                mutex_unlock(&dev->struct_mutex);
1169                atomic_dec(&dev->buf_alloc);
1170                return -EINVAL;
1171        }
1172
1173        entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1174                                   DRM_MEM_BUFS);
1175        if (!entry->buflist) {
1176                mutex_unlock(&dev->struct_mutex);
1177                atomic_dec(&dev->buf_alloc);
1178                return -ENOMEM;
1179        }
1180        memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1181
1182        entry->buf_size = size;
1183        entry->page_order = page_order;
1184
1185        offset = 0;
1186
1187        while (entry->buf_count < count) {
1188                buf = &entry->buflist[entry->buf_count];
1189                buf->idx = dma->buf_count + entry->buf_count;
1190                buf->total = alignment;
1191                buf->order = order;
1192                buf->used = 0;
1193
1194                buf->offset = (dma->byte_count + offset);
1195                buf->bus_address = agp_offset + offset;
1196                buf->address = (void *)(agp_offset + offset);
1197                buf->next = NULL;
1198                buf->waiting = 0;
1199                buf->pending = 0;
1200                init_waitqueue_head(&buf->dma_wait);
1201                buf->file_priv = NULL;
1202
1203                buf->dev_priv_size = dev->driver->dev_priv_size;
1204                buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1205                if (!buf->dev_private) {
1206                        /* Set count correctly so we free the proper amount. */
1207                        entry->buf_count = count;
1208                        drm_cleanup_buf_error(dev, entry);
1209                        mutex_unlock(&dev->struct_mutex);
1210                        atomic_dec(&dev->buf_alloc);
1211                        return -ENOMEM;
1212                }
1213                memset(buf->dev_private, 0, buf->dev_priv_size);
1214
1215                DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1216
1217                offset += alignment;
1218                entry->buf_count++;
1219                byte_count += PAGE_SIZE << page_order;
1220        }
1221
1222        DRM_DEBUG("byte_count: %d\n", byte_count);
1223
1224        temp_buflist = drm_realloc(dma->buflist,
1225                                   dma->buf_count * sizeof(*dma->buflist),
1226                                   (dma->buf_count + entry->buf_count)
1227                                   * sizeof(*dma->buflist), DRM_MEM_BUFS);
1228        if (!temp_buflist) {
1229                /* Free the entry because it isn't valid */
1230                drm_cleanup_buf_error(dev, entry);
1231                mutex_unlock(&dev->struct_mutex);
1232                atomic_dec(&dev->buf_alloc);
1233                return -ENOMEM;
1234        }
1235        dma->buflist = temp_buflist;
1236
1237        for (i = 0; i < entry->buf_count; i++) {
1238                dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1239        }
1240
1241        dma->buf_count += entry->buf_count;
1242        dma->seg_count += entry->seg_count;
1243        dma->page_count += byte_count >> PAGE_SHIFT;
1244        dma->byte_count += byte_count;
1245
1246        DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1247        DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1248
1249        mutex_unlock(&dev->struct_mutex);
1250
1251        request->count = entry->buf_count;
1252        request->size = size;
1253
1254        dma->flags = _DRM_DMA_USE_FB;
1255
1256        atomic_dec(&dev->buf_alloc);
1257        return 0;
1258}
1259
1260
1261/**
1262 * Add buffers for DMA transfers (ioctl).
1263 *
1264 * \param inode device inode.
1265 * \param file_priv DRM file private.
1266 * \param cmd command.
1267 * \param arg pointer to a struct drm_buf_desc request.
1268 * \return zero on success or a negative number on failure.
1269 *
1270 * According with the memory type specified in drm_buf_desc::flags and the
1271 * build options, it dispatches the call either to addbufs_agp(),
1272 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1273 * PCI memory respectively.
1274 */
1275int drm_addbufs(struct drm_device *dev, void *data,
1276                struct drm_file *file_priv)
1277{
1278        struct drm_buf_desc *request = data;
1279        int ret;
1280
1281        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1282                return -EINVAL;
1283
1284#if __OS_HAS_AGP
1285        if (request->flags & _DRM_AGP_BUFFER)
1286                ret = drm_addbufs_agp(dev, request);
1287        else
1288#endif
1289        if (request->flags & _DRM_SG_BUFFER)
1290                ret = drm_addbufs_sg(dev, request);
1291        else if (request->flags & _DRM_FB_BUFFER)
1292                ret = drm_addbufs_fb(dev, request);
1293        else
1294                ret = drm_addbufs_pci(dev, request);
1295
1296        return ret;
1297}
1298
1299/**
1300 * Get information about the buffer mappings.
1301 *
1302 * This was originally mean for debugging purposes, or by a sophisticated
1303 * client library to determine how best to use the available buffers (e.g.,
1304 * large buffers can be used for image transfer).
1305 *
1306 * \param inode device inode.
1307 * \param file_priv DRM file private.
1308 * \param cmd command.
1309 * \param arg pointer to a drm_buf_info structure.
1310 * \return zero on success or a negative number on failure.
1311 *
1312 * Increments drm_device::buf_use while holding the drm_device::count_lock
1313 * lock, preventing of allocating more buffers after this call. Information
1314 * about each requested buffer is then copied into user space.
1315 */
1316int drm_infobufs(struct drm_device *dev, void *data,
1317                 struct drm_file *file_priv)
1318{
1319        struct drm_device_dma *dma = dev->dma;
1320        struct drm_buf_info *request = data;
1321        int i;
1322        int count;
1323
1324        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1325                return -EINVAL;
1326
1327        if (!dma)
1328                return -EINVAL;
1329
1330        spin_lock(&dev->count_lock);
1331        if (atomic_read(&dev->buf_alloc)) {
1332                spin_unlock(&dev->count_lock);
1333                return -EBUSY;
1334        }
1335        ++dev->buf_use;         /* Can't allocate more after this call */
1336        spin_unlock(&dev->count_lock);
1337
1338        for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1339                if (dma->bufs[i].buf_count)
1340                        ++count;
1341        }
1342
1343        DRM_DEBUG("count = %d\n", count);
1344
1345        if (request->count >= count) {
1346                for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1347                        if (dma->bufs[i].buf_count) {
1348                                struct drm_buf_desc __user *to =
1349                                    &request->list[count];
1350                                struct drm_buf_entry *from = &dma->bufs[i];
1351                                struct drm_freelist *list = &dma->bufs[i].freelist;
1352                                if (copy_to_user(&to->count,
1353                                                 &from->buf_count,
1354                                                 sizeof(from->buf_count)) ||
1355                                    copy_to_user(&to->size,
1356                                                 &from->buf_size,
1357                                                 sizeof(from->buf_size)) ||
1358                                    copy_to_user(&to->low_mark,
1359                                                 &list->low_mark,
1360                                                 sizeof(list->low_mark)) ||
1361                                    copy_to_user(&to->high_mark,
1362                                                 &list->high_mark,
1363                                                 sizeof(list->high_mark)))
1364                                        return -EFAULT;
1365
1366                                DRM_DEBUG("%d %d %d %d %d\n",
1367                                          i,
1368                                          dma->bufs[i].buf_count,
1369                                          dma->bufs[i].buf_size,
1370                                          dma->bufs[i].freelist.low_mark,
1371                                          dma->bufs[i].freelist.high_mark);
1372                                ++count;
1373                        }
1374                }
1375        }
1376        request->count = count;
1377
1378        return 0;
1379}
1380
1381/**
1382 * Specifies a low and high water mark for buffer allocation
1383 *
1384 * \param inode device inode.
1385 * \param file_priv DRM file private.
1386 * \param cmd command.
1387 * \param arg a pointer to a drm_buf_desc structure.
1388 * \return zero on success or a negative number on failure.
1389 *
1390 * Verifies that the size order is bounded between the admissible orders and
1391 * updates the respective drm_device_dma::bufs entry low and high water mark.
1392 *
1393 * \note This ioctl is deprecated and mostly never used.
1394 */
1395int drm_markbufs(struct drm_device *dev, void *data,
1396                 struct drm_file *file_priv)
1397{
1398        struct drm_device_dma *dma = dev->dma;
1399        struct drm_buf_desc *request = data;
1400        int order;
1401        struct drm_buf_entry *entry;
1402
1403        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1404                return -EINVAL;
1405
1406        if (!dma)
1407                return -EINVAL;
1408
1409        DRM_DEBUG("%d, %d, %d\n",
1410                  request->size, request->low_mark, request->high_mark);
1411        order = drm_order(request->size);
1412        if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1413                return -EINVAL;
1414        entry = &dma->bufs[order];
1415
1416        if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1417                return -EINVAL;
1418        if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1419                return -EINVAL;
1420
1421        entry->freelist.low_mark = request->low_mark;
1422        entry->freelist.high_mark = request->high_mark;
1423
1424        return 0;
1425}
1426
1427/**
1428 * Unreserve the buffers in list, previously reserved using drmDMA.
1429 *
1430 * \param inode device inode.
1431 * \param file_priv DRM file private.
1432 * \param cmd command.
1433 * \param arg pointer to a drm_buf_free structure.
1434 * \return zero on success or a negative number on failure.
1435 *
1436 * Calls free_buffer() for each used buffer.
1437 * This function is primarily used for debugging.
1438 */
1439int drm_freebufs(struct drm_device *dev, void *data,
1440                 struct drm_file *file_priv)
1441{
1442        struct drm_device_dma *dma = dev->dma;
1443        struct drm_buf_free *request = data;
1444        int i;
1445        int idx;
1446        struct drm_buf *buf;
1447
1448        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1449                return -EINVAL;
1450
1451        if (!dma)
1452                return -EINVAL;
1453
1454        DRM_DEBUG("%d\n", request->count);
1455        for (i = 0; i < request->count; i++) {
1456                if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1457                        return -EFAULT;
1458                if (idx < 0 || idx >= dma->buf_count) {
1459                        DRM_ERROR("Index %d (of %d max)\n",
1460                                  idx, dma->buf_count - 1);
1461                        return -EINVAL;
1462                }
1463                buf = dma->buflist[idx];
1464                if (buf->file_priv != file_priv) {
1465                        DRM_ERROR("Process %d freeing buffer not owned\n",
1466                                  task_pid_nr(current));
1467                        return -EINVAL;
1468                }
1469                drm_free_buffer(dev, buf);
1470        }
1471
1472        return 0;
1473}
1474
1475/**
1476 * Maps all of the DMA buffers into client-virtual space (ioctl).
1477 *
1478 * \param inode device inode.
1479 * \param file_priv DRM file private.
1480 * \param cmd command.
1481 * \param arg pointer to a drm_buf_map structure.
1482 * \return zero on success or a negative number on failure.
1483 *
1484 * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1485 * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1486 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1487 * drm_mmap_dma().
1488 */
1489int drm_mapbufs(struct drm_device *dev, void *data,
1490                struct drm_file *file_priv)
1491{
1492        struct drm_device_dma *dma = dev->dma;
1493        int retcode = 0;
1494        const int zero = 0;
1495        unsigned long virtual;
1496        unsigned long address;
1497        struct drm_buf_map *request = data;
1498        int i;
1499
1500        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1501                return -EINVAL;
1502
1503        if (!dma)
1504                return -EINVAL;
1505
1506        spin_lock(&dev->count_lock);
1507        if (atomic_read(&dev->buf_alloc)) {
1508                spin_unlock(&dev->count_lock);
1509                return -EBUSY;
1510        }
1511        dev->buf_use++;         /* Can't allocate more after this call */
1512        spin_unlock(&dev->count_lock);
1513
1514        if (request->count >= dma->buf_count) {
1515                if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1516                    || (drm_core_check_feature(dev, DRIVER_SG)
1517                        && (dma->flags & _DRM_DMA_USE_SG))
1518                    || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1519                        && (dma->flags & _DRM_DMA_USE_FB))) {
1520                        struct drm_map *map = dev->agp_buffer_map;
1521                        unsigned long token = dev->agp_buffer_token;
1522
1523                        if (!map) {
1524                                retcode = -EINVAL;
1525                                goto done;
1526                        }
1527                        down_write(&current->mm->mmap_sem);
1528                        virtual = do_mmap(file_priv->filp, 0, map->size,
1529                                          PROT_READ | PROT_WRITE,
1530                                          MAP_SHARED,
1531                                          token);
1532                        up_write(&current->mm->mmap_sem);
1533                } else {
1534                        down_write(&current->mm->mmap_sem);
1535                        virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1536                                          PROT_READ | PROT_WRITE,
1537                                          MAP_SHARED, 0);
1538                        up_write(&current->mm->mmap_sem);
1539                }
1540                if (virtual > -1024UL) {
1541                        /* Real error */
1542                        retcode = (signed long)virtual;
1543                        goto done;
1544                }
1545                request->virtual = (void __user *)virtual;
1546
1547                for (i = 0; i < dma->buf_count; i++) {
1548                        if (copy_to_user(&request->list[i].idx,
1549                                         &dma->buflist[i]->idx,
1550                                         sizeof(request->list[0].idx))) {
1551                                retcode = -EFAULT;
1552                                goto done;
1553                        }
1554                        if (copy_to_user(&request->list[i].total,
1555                                         &dma->buflist[i]->total,
1556                                         sizeof(request->list[0].total))) {
1557                                retcode = -EFAULT;
1558                                goto done;
1559                        }
1560                        if (copy_to_user(&request->list[i].used,
1561                                         &zero, sizeof(zero))) {
1562                                retcode = -EFAULT;
1563                                goto done;
1564                        }
1565                        address = virtual + dma->buflist[i]->offset;    /* *** */
1566                        if (copy_to_user(&request->list[i].address,
1567                                         &address, sizeof(address))) {
1568                                retcode = -EFAULT;
1569                                goto done;
1570                        }
1571                }
1572        }
1573      done:
1574        request->count = dma->buf_count;
1575        DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1576
1577        return retcode;
1578}
1579
1580/**
1581 * Compute size order.  Returns the exponent of the smaller power of two which
1582 * is greater or equal to given number.
1583 *
1584 * \param size size.
1585 * \return order.
1586 *
1587 * \todo Can be made faster.
1588 */
1589int drm_order(unsigned long size)
1590{
1591        int order;
1592        unsigned long tmp;
1593
1594        for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1595
1596        if (size & (size - 1))
1597                ++order;
1598
1599        return order;
1600}
1601EXPORT_SYMBOL(drm_order);
1602
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